19. A coil is composed of circular loops of radius r = 5.13 cm and has N = 47 windings. A current, i = 1.27 A, flows through the coil, which is inside a homogeneous magnetic field of magnitude 0.911 T. What is the maximum torque on the coil due to the magnetic field? (A) 0.148Nt.m, (B) 0.211 Nt.m, (C) 0.350 Nt.m, (D) 0.450 Nt.m.